11
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Los calcretes del sudeste de la provincia de La Pampa: caracterización y origen

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          El paisaje en el extremo sudeste de la provincia de La Pampa, Argentina, está caracterizado por un relieve de mesetas muy disectadas entre las que se encuentran grandes bajos. Éstas, rematan en calcretes parcialmente cubiertos por depósitos eólicos. Regionalmente se han distinguido tres niveles de calcretes que fueron determinados por su altura relativa y por los diferentes grados de preservación de sus características geomorfológicas primarias. Cada uno de ellos representa la culminación de un ciclo depositacional, tres en total, que tuvieron lugar durante el Mioceno tardío-Plioceno. El objetivo de esta contribución es caracterizar los dos niveles más antiguos y establecer su origen. Para ello se analizó el contexto regional, se describieron perfiles de detalle y se tomaron muestras para efectuar estudios de microscopía óptica. La morfología de los perfiles, los espesores y las evidencias de actividad biológica (laminación y fábrica beta) concuerdan con las características típicas de los calcretes pedogenéticos, a su vez, indican que en la región hubo períodos con reducido aporte clástico, con estabilidad tectónica y un clima semiárido y régimen de temperatura del suelo térmico.

          Translated abstract

          The landscape in the southeastern extreme of La Pampa province in Argentina is characterized by highly dissected plateaus with to large shallow areas, which end in calcretes partially covered by eolian deposits. Regionally, there are three levels of calcretes distinguished according to their relative height and the different degrees of preservation of their primary geomorphologic features. Each level represents the end of a depositional cycle, which took place during the late Miocene-Pliocene. The aim of this contribution is to characterize the two oldest levels and to determine their origin. For that purpose, the regional context was analyzed, profiles were described in detail and some samples were collected for their microscopic studies. The profile morphology, their thicknesses and the evidence of biological activity (thinning and beta fabric) coincide with the typical features of pedogenic calcretes which, in turn, demostrate the existence of well-drained soils and also indicate that this region had periods of reduced clastic input, tectonic stability and a semiarid climate during those periods and termic soil.

          Related collections

          Most cited references 22

          • Record: found
          • Abstract: not found
          • Book: not found

          Calcretes

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Pilcomayo: Contribución al conocimiento de las llanuras argentinas

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Initial stages of laminar calcrete formation by roots: examples from the Neogene of central Spain

                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                raga
                Revista de la Asociación Geológica Argentina
                Rev. Asoc. Geol. Argent.
                Asociación Geológica Argentina (Buenos Aires )
                1851-8249
                March 2014
                : 71
                : 1
                : 92-99
                Affiliations
                [1 ] Servicio Geológico Minero Argentino
                Article
                S0004-48222014000100009
                Product
                Product Information: website
                Categories
                GEOLOGY
                GEOSCIENCES, MULTIDISCIPLINARY

                Comments

                Comment on this article